Apollo 11 astronauts Neil Armstrong, Michael Collins, Buzz Aldrin in quarantine on July 24, 1969, after walking on the moon due to fears of unknown pathogens they might have been exposed to.

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First manned mission to successfully land on the moon launched July 16, 1969.

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Footprint of Buzz Aldrin's boot, who landed on the moon during the Apollo 11 space mission July 20, 1969.

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Astronaut Buzz Aldrin, lunar module pilot, walks on the surface of the moon near the leg of the Lunar Module &quot;Eagle&quot; during the Apollo 11 space mission to the moon, July 20, 1969. Astronauts Armstrong and Aldrin descended in the lunar module to explore the &quot;Sea of Tranquility,&quot; a region on the surface of the moon.

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American broadcast journalist and TV news anchor Walter Cronkite keeps his eyes on his monitor as NASA's Apollo 11 mission touches down on the moon, July 20, 1969.